Many interspecies hybrids in nature turn out to be infertile so they are a dead end. The only problem that I have with snake hybrids is that most of them are fertile and capable of producing more hybrids and that's where the problem lies.
I've seen a number of times where breeding two sibling hybrids together you produce an extreme wide variety of looks, from animals that look exactly like either one of the original pure species to a complete mix. There is no way to predict what will happen, and my concern is that one of the animals that looks like a pure bred (which no matter what they look like is still a hybrid because they still contain many thousands of genes from another species) will be sold as a pure animal and end up in someones collection mucking up their breeding projects.
This has actually happened to me where I got a pair of interesting looking pine snakes. When I got offspring from them it was apparent that they were actually hybrids and they pretty much ruined my pine snake project.